<!--
Copyright 2017 The Closure Library Authors. All Rights Reserved.

Use of this source code is governed by the Apache License, Version 2.0.
See the COPYING file for details.
-->
<style>
 #cont {
    position: relative;
    border: 1px solid black;
    height: 100px;
    width: 100px;
  }
  #cont div {
    position: absolute;
    overflow: hidden;
  }
</style>
<div id="cont" style="">
</div>
<button onclick="drawTargets(targets, 10)">
 draw targets 1
</button>
<br/>
<button onclick="drawTargets(targets2, 1)">
 draw targets 2
</button>
<br/>
<button onclick="drawTargets(targets3, 10)">
 draw targets 3
</button>
<div id="container1">
 <div id="child1">
 </div>
 <div id="child2">
 </div>
</div>